Table 2.

Prior and Posterior Emissions From the Various Inversion Configurations Referred as the Reference Inversion Case (L = 4 km), a Decrease of 40% in the A Priori Traffic Emissions (Low Traffic), a Decrease of 40% in Emissions From the A Priori Energy Production Sector (Low Utility), Using Large Prior Emission Variances (Large ${\sigma }_B^2$), Using ODIAC as Prior Emissions (ODIAC), Assimilating Only Four Sites Out of Nine (Four Sites (A) and Four Sites (B)), Assimilating Only Four Sites Out of Nine With a Lower Correlation Length of L = 4 km (Four Sites A (L = 4 km) and Four Sites B (L = 4 km)), Varying the Correlation Length L in the Prior Emissions Errors (L = 0 km and L = 4 km), Varying the Definition of the Background Conditions Using the Wind Direction (Wind Model) or the Minimum of the Day (Daily Min), Assimilating Over a 10 Day Time Window Instead of 5 Days (10 Days), Filtering Hourly Observations Using Wind Model Errors (λ.ε), and Varying the Afternoon Window for Observations (20–23 UTC)

Case	L = 12 km	Low Traffic	Low Utility	Large ${\sigma }_B^2$	ODIAC	L = 4 km (RE
Prior	4.56	4.15	4.2	4.56	4.14	4.56
Posterior	5.79	5.16	5.24	6.13	5.35	5.5
Case	Wind model	Daily Min	10 days	λ.ε (& L = 12 km)	20–23 UTC	L = 0 km
Prior	4.56	4.56	4.56	4.56	4.56	4.56
Posterior	5.53	6.	5.88	5.73	5.69	4.73
Case	Four Sites (A)	Four Sites (B)	Four Sites A (L = 4 km)	Four Sites B (L = 4 km)
Prior	4.56	4.56	4.56	4.56
Posterior	5.36	5.52	5.13	5.17